Questions tagged [protocol]

A protcol is a ruleset for formatting and exchanging messages.

33 questions with no upvoted or accepted answers
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1answer
218 views

Analyze protocol used for Futaba VFD display, 3 data pins

I take apart a Samsung SMT-C7140 HD Unit (made obsolete by cable company, a shame) and found a nice display that I could probably reuse. It is a Futaba GL07-00006A (13-BT-246GINK). I tried to find the ...
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98 views

Offset QPSK Frame sync markers

What actual protocols exist out there that employ Offset Quadrature Phase-Shift Keying (OQPSK)? What do they use for the frame synchronization marker (or "preamble" or "sync word" or "flag")? Do ...
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0answers
59 views

Controller Area Network CANIDT

I am learning CAN protocol. It is a dumb question about CANIDT register. What is the link between Tag Identifier and Message Object. Is it arbitrary set by the programmer or is it linked with actual ...
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223 views

can i interface profinet protocol to ethernet interface?

i have a profinet device and an Ethernet port which is dedicated for KNX protocol. can i connect my profinet device to this Ethernet port?
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0answers
585 views

Which serial protocol or encoding scheme does this scoreboard use?

I am trying to decode a signal stream coming from a Nevco scoreboard controller: Packets like this are sent every ~2.7 ms. I suspect it is some sort of UART signal because it is on the RX line of a ...
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0answers
106 views

Do you consider this design as an application layer on top of the CAN protocol?

This is a follow up question from my previous question about How do I program 2 CAN nodes to transmit continuously in succession? I'm planning to add another layer on top of the CAN protocol and I ...
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0answers
71 views

SPI Slave implementation in software

I need to implement SPI Slave (@10Mhz clock) on a microcontroller (a sensor with Cortex M33 core) in software. The problem is software is not fast enough to prepare data just after the command. (also ...
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0answers
54 views

Splitting pins on USB-C

I’m new to EE and I have a project I’m working on that has confused me. I have an old display from a laptop that I want to make into a custom 2nd monitor, I bought a driver board for that model ...
1
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1answer
92 views

Trying to control vintage amplifier (TEAC A-H500) with Raspberry Pi - what's the communication protocol? 8-bit bus?

I'm trying to control my vintage amplifier from Raspberry Pi - I want to create a nice little Spotify streamer that on playback start will automatically turn on the amplifier and set the input ...
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0answers
88 views

Can you help me improve this circuit design?

I'm a electronic noobie and for a school project I need to design a circuit that will then be connected to a micro controller. The aim of the project is to build a sniffer to decode a particular ...
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238 views

How are MBIM transaction ID's supposed to be used?

Situation I am developing a product that will use this Sierra Wireless HL7618RD Cat 1 LTE modem. I am interfacing to the modem over USB using a small SoM running a Debian flavor of Linux. The modem is ...
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64 views

Addressable RS485

I have a requirement to take a board that interfaced with RS232 and put it on a half duplex RS485 bus. The obvious problem is that at the very least the board firmware will need to be altered to be ...
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1answer
47 views

Serial protocol and connector choice for tethered firmware distribution project

I am designing a system in which a central host controller that has a cellular internet connection is going to be used to query/control/flash intermittently tethered (wired) nodes. The central host ...
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362 views

CAN Bus Debug MCP25625 CAN to SPI to USB (MCP2210)

I am trying to build a CAN - USB converter using the MCP 25625 chip to convert CAN to SPI first and then receive/send the SPI data on an MCP 2210 chip of SPI interface and consequently convert to USB. ...
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177 views

Not seeing set_address packet using USBTrace

I'm currently exploring the wonderous world of the USB Stack. I'm using a PIC18F2550 and the USB IO example available at www.moty22.co.uk. The code works as expected, but when using USBTrace (or any ...
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2answers
455 views

What Transfer Protocol for “Streaming over USB”

I'm programming the FPGA on the Red Pitaya and I'm using it for gathering datas and generating images with those datas. Then, I need to transfer the images to an Android device. I so need to use the ...
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8 views

If Pointer Extension = 1, what should Pointer become then in J1939 standard - CAN bus

Assume that we have the EEPROM address 647 and we want to read to it. That can be done in J1939-21 CAN bus standard. But the problem I faceing is that if I'm using Pointer Extension = 1, then I can't ...
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12 views

What is “Number of occurrences” in DM16 - Binary data transfer at J1939 CAN-bus protocol

After I have send a DM14 memory access with the functionality read. Assume that I'm want to read 646 and 647 address. Then I want to use the lenght = 1, Pointer Type = 1(if I want DM15 message ...
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43 views

J1939 - CAN BUS - What is ECU and ACU?

I have a question about the CAN-bus protocol J1939. What is ECU and ACU? Assume that we have three motors that can be controller via J1939. Each motor have it's source address 0x80, 0x81 and 0x83 and ...
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60 views

Is there really a proper way to send private bits even 1 with CANBUS?

I was thinking of making an authentication protocol for canbus. Is there a way to send even 1bit privately to another node ? Have seen many implementations quite a few good ones. In particular ESA ...
0
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1answer
87 views

How to convert from 2 data line full duplex to 1 data line half duplex?

I'm trying to design a circuit that can convert from a two wire full duplex (think SPI), with one transmit line and one receive line, to a one wire half duplex (think i2c), with bidirectional ...
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36 views

HART Protocol - Logo/ Trademark details

Could you please share, advise any details on below. I am looking for details of HART trademark / Logo to add on my new product. Is it mandatory to have its logo on product, in datasheet? Where ...
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62 views

PROFIBUS Architecture for Ultrascale +: experts' opinion request

I'm working on the design of a custom carrier board based on a Xilinx Ultrazed-EG SOM. Specifically, the Carrier (embedding the SoM) should realize the PROFIBUS DP master node in the specific ...
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52 views

What is the difference between SDA protocol and I2C?

A manual for Sound Design Technology's "DSP Programmer" programming box has the following statement: Hearing aids based on the Sound Design Technologies Wolverine platform can be programmed ...
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1answer
127 views

Simplex UART echo implementation on ATtiny

I'm currently trying to implement a simple UART echo application on the ATtiny85, with no additional pins other than RX/TX (no autoflow control). I'm using the Universal Serial Interface of the ...
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72 views

IEC 60870-5 General Interrogation Command

Recently I watched a video explaining communication protocol IEC 60870-5. The video states that the General Interrogation (GI) command takes the following sequence Master Station sends an ...
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1answer
40 views

Pull up resistor selection for LIN bus

What exactly will happen if I use 1.2K ohms at LIN master node pull-up? Why does the LIN protocol spec recommend to use 1K typically?
0
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1answer
207 views

I need help to understand a sniffer circuit schematic

I'm an electrical engineering students and for a school project I need to understand a circuit schematic. First, I will provide some context. The school project I'm working on is the modification of a ...
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152 views

CLK signal on DAT0 line on SD protocol?

I'm facing some problems in the initialization stage of the SD protocol on a custom board, specifically when sending the ACMD51 command and reading the Status Card ...
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147 views

Identify TI motor driver IC (from old HP printer) or its control protocol

For fun, and as an exercise in reverse engineering junk hardware, I am trying to understand the internals of an HP DeskJet 840c printer from 2001. Specifically I am trying to understand how the motor ...
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91 views

Whats Reliable Burst Protocol(RBP)?

I couldn't find much details about this protocol than an IEEE paper which I couldn't download. Any quick comments on this?
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1answer
46 views

How to set a value of JESD

I'm trying to connect an ADC with an FPGA via JESD, but I'm not able to set a relevant parameter on in. Here is the link of the datasheet, where in the page 92 there are several parameters. In order ...
0
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1answer
88 views

Local Interconnect Network(LIN) default status

How does slave identification takes place in LIN protocol by the master ? What is the default status of a LIN bus ? How are collisions avoided in LIN ? What is the role of Sporadic frame ?